He introduced actors Ben McKenzie, Grant Gustin and Matt Ryan before the world premiere of Fox's Gotham, a screening of The CW's first episode of The Flash and footage from the upcoming third season of CW's Arrow. At the end of the night, they played the pilot for NBC's Constantine for fans who sat through the three-hour event.

In the Arrow footage, it was revealed that DC villain Ra's al Ghul will appear in season three. The part has not yet been cast.

The hero character, Ted Grant, known as Wildcat, will also be introduced.

Following the screenings, the cast and producers of all four shows participated in a panel session hosted by Geoff Johns of DC Comics.

Gotham premieres on FOX, September 22, The Flash debuts October 7 on The CW, Arrow returns to The CW October 8, and Constantine comes to NBC on October 24.